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  1. Frogs and their Eggs
  2. Conceptual image of chromosome
  3. Mission Santa Ynez or Ines, Solvang, California
  4. Abstract Alphabet
  5. Joachim Murat Reviews a Company of Black Soldiers in Koenigsberg
  6. Definition of anthropology
  7. Artillery drill in fort during the American Civil War
  8. 'London', plate 38 from 'Songs of Experience', 1794
  9. Old Mother Hubbard, from Old Mother Goose's Rhymes and Tales
  10. Humpty Dumpty
  11. Human bones
  12. Conceptual image of human lungs and rib cage
  13. The Man and the Alembic
  14. That Dam Cloud
  15. Volcanoes - USGS Earth as Art
  16. x-ray of head
  17. Microscopic view of plant tissues
  18. Comet of 1811, 19th century artwork
  19. Ceratosaurus
  20. Portrait of Anton Chekhov (1860-1904) 1902
  21. Conceptual image of influenza causing flu
  22. Conceptual image of DNA
  23. Conceptual image of DNA
  24. Ida B. Wells, 1891
  25. Human skeleton
  26. The muscles of the hand
  27. Battle of Waterloo, June 18, 1815, 3rd Grenadier of Guard commanded by Cambronne
  28. Soybeans, early growth, Minnesota
  29. Skeleton Chart
  30. Vintage American history print of a younger President Theodore Roosevelt
  31. ABCs
  32. Women working in a munitions factory in 1915
  33. Human Skin
  34. Artist's concept depicting the evolution of a lobe-finned fish to an amphibian
  35. Apatosaurus
  36. 1980's UK Womans Weekly Magazine Cover
  37. Mankind in the Making
  38. Wanted poster for Jesse James
  39. Euoplocephalus
  40. Body Plans of Extinct Reptiles
  41. Civil War print of Abraham Lincoln riding on horseback as a crowd cheers
  42. Brachiosaurus
  43. School Days
  44. Science classroom
  45. A Black Soldier In the Union Army Leading A Supply Train, 1864
  46. Royal Court of French King Francis I at the Castle of Blois
  47. Lifecycle of a Frog
  48. Detached blood clot, artwork